Updating python version badge

[apetenchea]

I forgot about the badge in my last PR.

I doesn't warrant a new release though. We no longer officially support 3.8, but the code works perfectly fine right now.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.62%. Comparing base (8e6aaca) to head (4ce4d6d).
Report is 11 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #363      +/-   ##
==========================================
- Coverage   95.94%   94.62%   -1.33%     
==========================================
  Files          26       26              
  Lines        4296     4298       +2     
==========================================
- Hits         4122     4067      -55     
- Misses        174      231      +57     

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